Kotlin 中的 java.lang.NoClassDefFoundError $$inlined$forEach$lambda$1

问题描述

我目前正在使用 Kotlin 1.1.1 版开发 Android 应用程序

I am currently working on an Android application with Kotlin in version 1.1.1

在我的代码中，为了读取多个 MutableList 和 MutableMap，我使用了多个 forEach 结构.

In my code, I have imbrication of several forEach structures in order to read several MutableList and MutableMap.

不幸的是，我的应用程序崩溃并显示以下堆栈跟踪:

Unfortunately, my app crashes with the following stacktrace :

java.lang.NoClassDefFoundError:com.package.fragment.ReminderAddFragment$onRetrieveBusinessObjects$$inlined$forEach$lambda$1在com.package.fragment.ReminderAddFragment.onRetrieveBusinessObjects(ReminderAddFragment.kt:275)在com.smartnsoft.droid4me.app.Droid4mizer.onRetrieveBusinessObjects(Droid4mizer.java:552)在com.smartnsoft.droid4me.app.Droid4mizer.onRetrieveBusinessObjectsInternal(Droid4mizer.java:606)在com.smartnsoft.droid4me.app.Droid4mizer.access$000(Droid4mizer.java:46)在 com.smartnsoft.droid4me.app.Droid4mizer$1.run(Droid4mizer.java:197)在java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:423)在 java.util.concurrent.FutureTask.run(FutureTask.java:237) 在java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)在java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)在 java.lang.Thread.run(Thread.java:818)

这里是代码

tutorialCategories.forEach { (_, _, _, _, _, tutorials) ->
  tutorials.forEach { tutorial ->
    if (tutorial.id == simpleReminderFromExtra.tutorialId)
    {
      //...
      val mapOfreminders = mutableMapOf<Int, MutableList<Reminder>>()
      val reminders = ReminderServices.getReminderByTutorialId(simpleReminderFromExtra.tutorialId)

      reminders.forEach { reminder ->
        //...
      }

      mapOfreminders.forEach { _, finalReminders ->
        //...

        finalReminders.forEach { reminder ->
          //...
        }

        //...
      }
    }
  }
}

哪里:

• tutorialCategories 是一个 List ;
• tutorials 是一个 List ;
• reminders 是一个 List ;

• tutorialCategories is a List ;
• tutorials is a List ;
• reminders is a List ;

代码的第 275 行是 mapOfreminders.forEach { _, finalReminders ->.

The line 275 of the code is mapOfreminders.forEach { _, finalReminders ->.

在调试器中，我可以评估 mapOfreminders 变量，一切似乎都没有问题.

In the debugger, I can evaluate the mapOfreminders variable and everything seems to be alright.

如果有人可以帮助解决这个问题！

If someone can help to resolve this issue !

推荐答案

阅读 Dan Lew 的 post 几天前，我会建议使用 Map.forEach { k, v ->} 来自 Java 8 的方法，该方法可能在 Android 运行时中不可用.

After reading Dan Lew's post a couple days ago, I'll make a suggestion that this can be caused by using Map.forEach { k, v -> } method from Java 8, which may be unavailable in Android runtime.

您可以尝试使用另一个 forEach 带有来自 Kotlin 标准库的单入口参数:

You could try to use another forEach with the single entry parameter that comes from the Kotlin standard library:

mapOfreminders.forEach { (_, finalReminders) -> }

这里的括号用于将入口参数分解为两个变量:忽略的键和finalReminders值.

Here the parentheses are used to destructure entry parameter into two variables: ignored key and finalReminders value.

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